The present invention relates to an I/O device capable of collectively managing and easily editing AV data recorded by a plurality of video cameras with transfer bit rate between devices kept constant, and an I/O management system. The I/O management system according to the present invention comprises: a storage device having a non-linear accessible recording medium; a control unit for controlling output of externally supplied data with respect to the storage device, or input of data from the storage device; and one or more I/O device having a record information management unit for managing, through a file system, record information acquired at the time when data is recorded onto the recording medium, and controls input of data from the storage device on the basis of the record information managed by a file system at the time of reproduction.